Gas hydrates inhibition via combined biomolecules and synergistic materials at wide process conditions

Altamash, Tausif; Qureshi, M. Fahed; Aparício, Santiago; Aminnaji, Morteza; Tohidi, Bahman; Atilhan, Mert

doi:10.1016/j.jngse.2017.07.034

Cited by 57 publications

(27 citation statements)

References 53 publications

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“…Because the AAs are generally not biodegradable, they can have a large environmental impact if they are released from the pipelines into the ocean. To resolve such environmental issues, a few biodegradable surfactants have been suggested as potential AAs, but they still do not have sufficient performance compared with conventional AAs [21][22][23]. Although low dosages of KHIs or AAs have recently been used to prevent hydrate formation, the materials used in the industry are toxic and accumulate in living things.…”

Section: Introductionmentioning

confidence: 99%

Anti-Agglomeration Effects of Biodegradable Surfactants from Natural Sources on Natural Gas Hydrate Formation

Kang

Lee

2020

Energies

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Kinetic hydrate inhibitors (KHI) and anti-agglomerants (AA) rather than thermodynamic hydrate inhibitors (THI) are often used for flow assurance in pipelines. This is because they require much lower dosages than thermodynamic inhibitors. Although the hydrate-phase equilibria are not affected, KHI and AA prevent the formed hydrate crystals from growing to a bulky state causing pipeline blockage. However, these KHIs might have huge environmental impact due to leakages from the pipelines. In this study, two biodegradable AA candidates from natural sources (that is, lecithin and lanolin) are proposed and their performances are evaluated by comparing them with and without a conventional AA (Span 80, sorbitan monooleate). At 30% and 50% water cut, the addition of AA materials was found to enhance the flow characteristics substantially in pipelines and hardly affected the maximum value of the rotational torque, respectively. Considering the cost-effective and environmental advantages of the suggested AA candidates over a conventional AA such as Span 80, the materials are thought to have potential viability for practical operation of oil and gas pipelines. However, additional investigations will be done to clarify the optimum amounts and the action mechanisms of the suggested AAs.

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Section: Introductionmentioning

confidence: 99%

Anti-Agglomeration Effects of Biodegradable Surfactants from Natural Sources on Natural Gas Hydrate Formation

Kang

Lee

2020

Energies

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“…Characterization of the studied NADES samples including FTIR, TGA, viscosity, and density was reported in our recent publications. − Density experiments were conducted via an AntonPaar automated vibrating tube densimeter at atmospheric conditions at various isotherms up to 90 °C and experimental density plots with linear-monotonically decreasing profiles (with R 2 ∼ 0.99) with the increasing temperature for the studied NADES samples and reported in our previous works. Water content of the presented samples was also reported (via the Karl/Fisher method) in Table .…”

Section: Resultsmentioning

confidence: 99%

“…In previous works, we targeted mainly CO 2 solubility and rheology behavior of some select NADES systems. − In this work we present high-pressure CH 4 solubility in NADES systems that are produced by using alanine (Al), betaine (Be), and choline chloride (ChCl) as HBA and lactic acid (La), malic acid (Ma), and phenylacetic acid (Paa) as HBD. These systems, which contain only naturally available products, are proposed with the motivation of forming complete environmentally benign solvents to tackle the above-mentioned industrial issue.…”

Section: Introductionmentioning

confidence: 99%

Combined Experimental and Theoretical Study on High Pressure Methane Solubility in Natural Deep Eutectic Solvents

Altamash

Amhamed

Aparício

2019

Ind. Eng. Chem. Res.

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In this paper, we report high pressure experimental measurements and detailed density functional theory (DFT) as well as molecular dynamic (MD) simulations of methane (CH 4 ) solubility in natural deep eutectic solvents (NADESs) that were prepared by using alanine (Al), betaine (Be), and choline chloride (ChCl) used as hydrogen bond acceptors (HBA) and lactic acid (La), malic acid (Ma), and phenylacetic acid (Paa) used as hydrogen bond donors (HBD). Experiments were performed on Al:La, Be:La, ChCl:La, ChCl:Ma, and ChCl:Paa systems up to 50 bar at 298.15 K. Meanwhile, this work includes the quantum theory of atoms in molecules (QTAIM) calculations that allow quantifying and characterizing the short-range interactions of studied systems, which is reported for the first time for NADESs and CH 4 interactions. Furthermore, MD simulations shed light onto the characteristics of intermolecular forces, particularly for hydrogen bonding, molecular arrangements in the liquid phases, and their role in fluid's properties. The presented results showed that the studied NADESs can be used for selective CO 2 /CH 4 separation in gas processing applications.

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“…Afterwards, the cells were charged with the CO 2 at a given pressure as required for the experiment. The detailed description of the rocking cell apparatus can be found elsewhere [ 45 , 56 , 70 ]. Different methods were used to study the phase behavior, induction time and formation and dissociation kinetics of hydrates in Milli-Q water and in aqueous solutions of ionic liquids as described below.…”

Section: Methodsmentioning

confidence: 99%

Effect of Thiouronium-Based Ionic Liquids on the Formation and Growth of CO2 (sI) and THF (sII) Hydrates

Soromenho¹,

Keba²,

Esperança³

et al. 2022

IJMS

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In this manuscript, two thiouronium-based ionic liquids (ILs), namely 2-ethylthiouronium bromide [C2th][Br] and 2-(hydroxyethyl)thiouronium bromide [C2OHth][Br], were tested at different concentrations (1 and 10 wt%) for their ability to affect CO2 (sI) and tetrahydrofuran (THF) (sII) hydrate formation and growth. Two different methods were selected to perform a thermodynamic and kinetic screening of the CO2 hydrates using a rocking cell apparatus: (i) an isochoric pressure search method to map the hydrate phase behavior and (ii) a constant ramping method to obtain the hydrate formation and dissociation onset temperatures. A THF hydrate crystal growth method was also used to determine the effectiveness of the ILs in altering the growth of type sII hydrates at atmospheric pressure. Hydrate–liquid–vapor equilibrium measurements revealed that both ILs act as thermodynamic inhibitors at 10 wt% and suppress the CO2 hydrate equilibria ~1.2 °C. The constant ramping methodology provides interesting results and reveals that [C2OHth][Br] suppresses the nucleation onset temperature and delays the decomposition onset temperatures of CO2 hydrates at 1 wt%, whereas suppression by [C2th][Br] was not statistically significant. Normalized pressure plots indicate that the presence of the ILs slowed down the growth as well as the decomposition rates of CO2 hydrates due to the lower quantity of hydrate formed in the presence of 1 wt% ILs. The ILs were also found to be effective in inhibiting the growth of type sII THF hydrates without affecting their morphology. Therefore, the studied thiouronium ILs can be used as potential dual-function hydrate inhibitors. This work also emphasizes the importance of the methods and conditions used to screen an additive for altering hydrate formation and growth.

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Gas hydrates inhibition via combined biomolecules and synergistic materials at wide process conditions

Cited by 57 publications

References 53 publications

Anti-Agglomeration Effects of Biodegradable Surfactants from Natural Sources on Natural Gas Hydrate Formation

Anti-Agglomeration Effects of Biodegradable Surfactants from Natural Sources on Natural Gas Hydrate Formation

Combined Experimental and Theoretical Study on High Pressure Methane Solubility in Natural Deep Eutectic Solvents

Effect of Thiouronium-Based Ionic Liquids on the Formation and Growth of CO2 (sI) and THF (sII) Hydrates

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